I would like to have any of the characters as my sibling but I think Noda-kun would make an awesome older brother. He's devoted and protective but he can get carried away and come off as an idiot but that's exactly why I would Liebe to have him as a sibling.
I think I would want Hinata as a brother. I think it would be pretty awesome, since he is a great guy and very caring of his Friends and loved ones, despite being a bit of a goofball sometimes. Plus, he's probably smarter than any impression of intelligence he gives off to the viewer.